Climate of NW3

Much like the rest of London, this is a function of its proximity to the European continent, positioning close to the North Atlantic
and the North Sea, and to some extent the Urban Heat Island effect and London's rather northerly latitude.
The direction of the wind (or more precisely the air mass this brings) is largely responsible for which of these sources most influences the day-to-day weather.
With the prevailing wind being broadly south-westerly (bringing tropical maritime air), this gives London its climate of consistent rainfall throughout the year,
relatively low sunshine total and few snow days, as well as a lack of extremes of temperature, those generally coming when the wind switches away from this direction
- to the Arctic north or Polar north-east for cold, and to the Continental south or south east for heat.

Thunderstorms are not frequent, and generally comparatively weak
compared to those of the near continent. Days of strong winds do occasionally occur, and along with the odd short-lived heat wave or icy cold snap,
are the only real hazards in NW3, flooding not being a problem to this hilly area of London, home to inner London's highest point (Whitestone Pond,
134 m).

Long-term Climate Averages

These are estimates for the long-term average weather conditions, i.e. the climate, at NW3.
They were derived from data for the period 1971-2000 - the WMO
standard reference period - from nearby official Met Office sites.
(Mostly the one at Whitestone Pond (see above), which although less than a couple of miles away, is some 80 m higher up in terms of elevation.)Some adjustments have therefore been made to reflect the different siting conditions.
Rainfall values were updated in Sep 2012 to reflect more accurate analysis of nearby station data.

Temperature / °C

Rain / mm

WindSpeed/ mph

Days Of

Days Of Snow

WetHours

Sun Hrs(% of max)

Min

Max

Mean

Range

Rainfall

>1mmDays

AirFrost

Thunder

Lying

Falling

Jan

2.4

7.0

4.7

4.6

55

11

5.2

7

0.4

2.5

5

67

46 (20)

Feb

2.2

7.6

4.9

5.4

40

9

5.1

7

0.3

2.5

5

52

75 (30)

March

3.6

10.4

7.0

6.8

44

10

5.2

3

0.6

0.4

4

53

105 (32)

April

5.0

12.8

8.9

7.8

49

10

4.9

1

1

0.2

2

46

137 (36)

May

8.3

16.7

12.5

8.4

51

9

4.7

0.1

2

0

0

40

190 (43)

June

11.1

20.2

15.6

9.1

55

9

4.4

0

3

0

0

37

191 (42)

July

13.4

22.4

17.9

9.0

42

7

4.3

0

2.5

0

0

34

185 (41)

Aug

13.2

22.2

17.7

9.0

53

8

4.0

0

2.5

0

0

38

182 (44)

Sep

11.1

18.7

14.9

7.6

57

9

3.9

0

2

0

0

41

138 (40)

Oct

8.8

14.6

11.7

5.8

65

10

4.1

0.2

1

0

0

49

106 (36)

Nov

5.0

10.2

7.6

5.2

56

10

4.6

2

0.4

0.3

1

63

68 (29)

Dec

3.2

7.8

5.5

4.6

56

11

5.1

6

0.3

1

3

62

48 (22)

Winter

2.6

7.5

5.0

4.9

151

31

5.1

20

1

6

13

181

169 (24)

Spring

5.6

13.3

9.5

7.7

144

29

4.9

4.1

3.6

0.6

6

139

432 (38)

Summer

12.6

21.6

17.1

9.0

150

24

4.2

0

8

0

0

109

558 (42)

Autumn

8.3

14.5

11.4

6.2

178

29

4.2

2.2

3.4

0.3

1

153

312 (36)

Sum

623

113

26.3

16

6.9

20

582

1471 (36)

Annual

7.3

14.2

10.7

6.9

52

9.4

4.6

2.2

1.3

0.6

1.7

48.5

122.6 (36)

Range

11.2

15.4

13.2

4.5

25

4

1.3

7

2.7

2.5

5

33

145

A day-by-day progression of the temperature averages can be found here.